CN105014006B - A kind of casting of the aluminium alloy containing titanium dioxide is oozed with coating and the method using its preparation casting impregnation coating - Google Patents
A kind of casting of the aluminium alloy containing titanium dioxide is oozed with coating and the method using its preparation casting impregnation coating Download PDFInfo
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- CN105014006B CN105014006B CN201510471180.6A CN201510471180A CN105014006B CN 105014006 B CN105014006 B CN 105014006B CN 201510471180 A CN201510471180 A CN 201510471180A CN 105014006 B CN105014006 B CN 105014006B
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Abstract
The invention provides one kind contains TiO2Aluminium alloy casting ooze with coating and using its preparation casting impregnation coating method, the coating is mainly by made by the component of following weight ratio：30～50 parts of TiO2, 38～55 parts of CrO3, 3～10 parts of fused salt, 3～6 parts of sodium fluorides, 1～3 part of binding agent.Relative to prior art, aluminium alloy casting of the present invention is oozed with coating and the method using its preparation casting impregnation coating, not only have manufacturing process few, manufacturing cycle is short, the advantage of the advantages of low production cost, it is most important that by specific coating, with reference to Infiltration technology, the made coating suitable for aluminium alloy, its corrosion resistance are greatly improved；Meanwhile, the thickness of gained coating can at utmost reduce the impact to aluminium alloy thermal conductivity in a few micrometers between more than ten microns.
Description
Technical field
The present invention relates to a kind of casting of the aluminium alloy containing titanium dioxide is oozed with coating and the side using its preparation casting impregnation coating
Method, can effectively improve the decay resistance of Cast aluminium alloy gold surface, belong to casting technology field.
Background technology
Aluminium is a kind of active metal of chemical property, is just easy at normal temperatures react with oxygen, generates one layer of cause
Close and firm aluminum oxide film. this layer film can prevent the aluminium of internal layer from further aoxidizing, and can meet used in everyday wanting
Ask.But under weak acid, alkalescence condition, the effect of this tunic is limited, it is impossible to effectively prevent the corrosion of aluminium alloy, thus, to aluminium
The decay resistance of alloy is put forward higher requirement.
Such as application of the cast aluminium in condensing type water heater.Condensing heat exchanger is set up in gas heater afterbody, it is possible to decrease row
Cigarette temperature, by the water vapor condensation in flue gas while obvious heat of smoke is discharged, is allowed to discharge latent heat of liquefaction, therefore its thermal efficiency
More conventional water heater is high by 10%～15%.Generally its exhaust gas temperature is less than 110 DEG C, and the thermal efficiency is not less than 96%.Using condensing
Another benefit of gas heater is that condensed water can be by SO in flue gasxAnd NOxDissolve Deng sour gas, can effectively reduce flue gas
The pollution that discharge is caused, mitigates environmental pollution.
The heat conductivility of cast aluminium is excellent, and, apparently higher than cast iron, aluminium is cheap in addition for thermal conductivity, is adapted to industrial big rule
Mould is used.Secondly, in design, the Reliable Design of cast aluminium heat exchanger also makes it have sufficient advantage：Aluminium heat-exchange device
Wall thickness it is big, on the basis of higher heat transfer intensity is ensured, higher hydraulic pressure can be born, remain steady in a long-term and run；And
There is after aluminum alloy melting good mobility, casting and excellent processability.Based on these features, cast aluminium condensing heat exchanger is near
It is developed rapidly over year.
But as acidic materials are dissolved in condensed water the acidic liquid for defining pH value about 3～5, meeting heat exchanger is cold
The aluminium alloy of solidifying section produces serious corrosion, reduces the service life of water heater, affects the security for using.
Casting is oozed, and is will to form the various alloy powder adhesions of surface particularity ergosphere, and paste solid or apply
Brush in the particular surface of casting mold, then pour into a mould liquid metals, using its heat make coating material fusing and with base metals thing
Reason is combined or reaction bonded, so as to the technology of the coating with property is formed in cast(ing) surface.With existing use anodic oxidation, electricity
Plating, chemical plating, laser melting coating, differential arc oxidation and plasma spraying etc., aluminium alloy surface treatment method are compared, and casting is oozed need not be special
The equipment of door, is not limited by cast shape, can be processed any surface of foundry goods, and conventional cast and material surface are combined by it
Reinforcement technique combines, and is surface-treated while casting, and it is solidifying to take full advantage of the waste heat and molten metal of molten metal
Gu when latent heat, without the need for following process, operation is simple, and energy consumption is reduced.
At present, the research of existing Infiltration technology also has Mg alloy castings technology of infiltration casting in recent years mainly around ferrous metal
Research, and there is presently no the research that Infiltration technology is applied to aluminium alloy.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the invention provides it is a kind of containing titanium dioxide (under
Literary abbreviation TiO2) aluminium alloy casting ooze with coating and using its preparation casting impregnation coating method.
Technical scheme：For achieving the above object, present invention offer one kind contains TiO2Aluminium alloy casting ooze and use coating, its master
Will be by made by the component of following weight ratio：
30～50 parts of TiO2, 38～55 parts of CrO3, 3～10 parts of fused salt, 3～6 parts of sodium fluorides, 1～3 part of binding agent.
Preferably, described contains TiO2Aluminium alloy casting ooze with coating mainly by the component institute of following weight ratio
Make：
40 parts of TiO2, 45 parts of CrO3, 5 parts of fused salt, 3 parts of sodium fluorides, 2 parts of binding agents.
As another kind of preferred, the TiO2Particle size >=250 mesh.
As another kind preferably, the fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
As another kind preferably, the binding agent sodium carboxymethylcellulose or polyvinyl alcohol.
Present invention also offers containing TiO using described2Aluminium alloy casting ooze with coating preparation cast impregnation coating method, bag
Include following steps：
(1) take TiO2、CrO3, fused salt, sodium fluoride and binding agent be well mixed, add pure water to make coating；
(2) above-mentioned coating is coated in into casting mold die cavity or core surface, is dried under the conditions of temperature is for 100～120 DEG C；
(3) melted aluminium liquid is poured into the coating on above-mentioned die cavity or core surface, aluminium liquid and die cavity or core surface
Generation interacts, and obtains final product the coating in cast(ing) surface.
Preferably, the casting mold is waterglass sand mold, resin bonded sand mould or core.
As another kind preferably, the pouring temperature is 720～750 DEG C.
Beneficial effect：Relative to prior art, aluminium alloy casting of the present invention is oozed with coating and using its preparation casting impregnation coating
Method, not only few with manufacturing process, the manufacturing cycle is short, advantage the advantages of low production cost, it is most important that by specific
Coating, with reference to Infiltration technology, the made coating suitable for aluminium alloy, its corrosion resistance are greatly improved；Meanwhile, gained coating
Thickness in a few micrometers between more than ten microns, at utmost reduce the impact to aluminium alloy thermal conductivity.
Specific embodiment
The present invention is further described with reference to embodiment.
Embodiment 1
Component and proportioning：
50 parts of TiO2, 55 parts of CrO3, 8 parts of fused salt, 5 parts of sodium fluorides, 1 part of sodium carboxymethylcellulose；
The TiO2Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) take TiO2、CrO3, fused salt, sodium fluoride and sodium carboxymethylcellulose be well mixed, add pure water to make coating；
(2) above-mentioned coating is coated in into waterglass sand mold die cavity, is dried under the conditions of temperature is for 100 DEG C；
(3) melted aluminium liquid is poured into into above-mentioned die cavity, pouring temperature is 720 DEG C, the coating of aluminium liquid and mold cavity surface
Generation interacts, and obtains final product the coating in cast(ing) surface.
Embodiment 2
Component and proportioning：
50 parts of TiO2, 40 parts of CrO3, 3 parts of fused salt, 3 parts of sodium fluorides, 1 part of polyvinyl alcohol；
The TiO2Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) take TiO2、CrO3, fused salt, sodium fluoride and polyvinyl alcohol it is uniform, add pure water to make coating；
(2) above-mentioned coating is coated in into resin bonded sand mould die cavity, is dried under the conditions of temperature is for 120 DEG C；
(3) melted aluminium liquid is poured into into above-mentioned die cavity, pouring temperature is 750 DEG C, the coating of aluminium liquid and mold cavity surface
Generation interacts, and obtains final product the coating in cast(ing) surface.
Embodiment 3
Component and proportioning：
30 parts of TiO2, 55 parts of CrO3, 6 parts of fused salt, 3 parts of sodium fluorides, 1 part of sodium carboxymethylcellulose；
The TiO2Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) take TiO2、CrO3, fused salt, sodium fluoride and sodium carboxymethylcellulose be well mixed, add pure water to make coating；
(2) above-mentioned coating is coated in into core surface, is dried under the conditions of temperature is for 110 DEG C；
(3) melted aluminium liquid is poured into into above-mentioned die cavity, pouring temperature is 740 DEG C, the coating on aluminium liquid and core surface
Generation interacts, and obtains final product the coating in cast(ing) surface.
Embodiment 4
Component and weight ratio：
40 parts of TiO2, 45 parts of CrO3, 5 parts of fused salt, 3 parts of sodium fluorides, 2 parts of sodium carboxymethylcelluloses；
The TiO2Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) take TiO2、CrO3, fused salt, sodium fluoride and sodium carboxymethylcellulose be well mixed, add pure water to make coating；
(2) above-mentioned coating is coated in into core surface, is dried under the conditions of temperature is for 110 DEG C；
(3) melted aluminium liquid is poured into into above-mentioned die cavity, pouring temperature is 730 DEG C, the coating on aluminium liquid and core surface
Generation interacts, and obtains final product the coating in cast(ing) surface.
Embodiment 5
Component and proportioning：
35 parts of TiO2, 55 parts of CrO3, 4 parts of fused salt, 3 parts of sodium fluorides, 3 parts of polyvinyl alcohol；
The TiO2Particle size >=250 mesh；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions.
Preparation method：
(1) take TiO2、CrO3, fused salt, sodium fluoride and polyvinyl alcohol it is uniform, add pure water to make coating；
(2) above-mentioned coating is coated in into waterglass sand mold die cavity, is dried under the conditions of temperature is for 120 DEG C；
(3) melted aluminium liquid is poured into into above-mentioned die cavity, pouring temperature is 740 DEG C, the coating of aluminium liquid and mold cavity surface
Generation interacts, and obtains final product the coating in cast(ing) surface.
The corrosion resistance detection of experimental example present invention gained coating
(1) prepared by sample.Length of side 8mm is prepared, the prismatic sample of long 20mm cleans post-drying with water.By cylinder top
Uncoated face coats one layer of epoxy resin, measures the original weight of sample, calculate its surface area after solidification.
(2) corrosive medium is prepared.Mixed with the deionized water of certain volume with the analytical pure sulfuric acid that mass fraction is 98%,
Prepare the corrosive liquid of pH=3.
(3) corrosion test.Beaker of the product of trying to please for 500ml, cleans post-drying with distilled water, adds the H for preparing2SO4 is molten
Liquid, is put into sample.Beaker is put into into 25 DEG C of insulating box, a corrosive liquid is every other day changed, respectively 72,120,168,240
With 336 hours after take out sample, cleaning sample surface simultaneously weighs its weight.
(4) interpretation of result.The corrosion resistance of coating is analyzed using weight-loss method, average corrosion rate is calculated with following formula：
In formula, v is corrosion rate (g/m2H), m0For the weight (g) before sample corrosion, m1Corrosion product is removed for sample
Weight (g) afterwards, S are that specimen surface accumulates (m2), t is etching time (h).
Corrosion resistance detection is carried out to 3,4 and 5 gained coating of the embodiment of the present invention using said method, not add coating
Primary sample is shown in Table 1. as reference substance, testing result
Corrosion rate (the g/m of 1 each sample different time points of table2·h)
Can be obtained by 1 result of table, present invention gained coating sample occurs in significantly not corroding for first 72 hours for immersion,
336 hours, corrosion rate was about the 33～43% of primary sample, and rotproofness performance is significantly improved.
Claims (7)
1. one kind contains TiO2Aluminium alloy casting ooze and use coating, it is characterised in which is mainly by the component institute of following weight ratio
Make：
30～50 parts of TiO2, 38～55 parts of CrO3, 3～10 parts of fused salt, 3～6 parts of sodium fluorides, 1～3 part of binding agent；
The fused salt is by NaCl, KCl and MgCl2It is 18 by mole ratio：47：35 compositions；
Ooze the method for impregnation coating being cast with coating preparation using aluminium alloy casting, comprise the following steps：
(1) take TiO2、CrO3, fused salt, sodium fluoride and binding agent be well mixed, add pure water to make coating；
(2) above-mentioned coating is coated in into casting mold die cavity or core surface, is dried under the conditions of temperature is for 100～120 DEG C；
(3) coating that melted aluminium liquid is poured into above-mentioned die cavity or core surface, aluminium liquid and die cavity or core surface is occurred
Interact, the coating is obtained final product in cast(ing) surface.
2. according to claim 1 containing TiO2Aluminium alloy casting ooze and use coating, it is characterised in which is mainly by following heavy
Made by the component of amount part ratio：
40 parts of TiO2, 45 parts of CrO3, 5 parts of fused salt, 3 parts of sodium fluorides, 2 parts of binding agents.
3. according to claim 1 containing TiO2Aluminium alloy casting ooze and use coating, it is characterised in that the TiO2Particle
Size >=250 mesh.
4. according to claim 1 containing TiO2Aluminium alloy casting ooze and use coating, it is characterised in that the binding agent is carboxylic
Sodium carboxymethylcellulose pyce or polyvinyl alcohol.
5. TiO is contained using described in any one of claim 1-42Aluminium alloy casting ooze with coating preparation cast impregnation coating method, its
It is characterised by, comprises the following steps：
(1) take TiO2、CrO3, fused salt, sodium fluoride and binding agent be well mixed, add pure water to make coating；
(2) above-mentioned coating is coated in into casting mold die cavity or core surface, is dried under the conditions of temperature is for 100～120 DEG C；
(3) coating that melted aluminium liquid is poured into above-mentioned die cavity or core surface, aluminium liquid and die cavity or core surface is occurred
Interact, the coating is obtained final product in cast(ing) surface.
6. it is according to claim 5 prepare casting impregnation coating method, it is characterised in that the casting mold be waterglass sand mold or
Resin bonded sand mould.
7. it is according to claim 5 to prepare the method for casting impregnation coating, it is characterised in that when pouring into a mould in the step (3)
Temperature is 720～750 DEG C.
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| CN201510471180.6A CN105014006B (en) | 2015-08-04 | 2015-08-04 | A kind of casting of the aluminium alloy containing titanium dioxide is oozed with coating and the method using its preparation casting impregnation coating |
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| CN201510471180.6A CN105014006B (en) | 2015-08-04 | 2015-08-04 | A kind of casting of the aluminium alloy containing titanium dioxide is oozed with coating and the method using its preparation casting impregnation coating |
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| CN105268910A (en) * | 2015-10-21 | 2016-01-27 | 南京润屹电子科技有限公司 | Graphene enhanced type valve accessory casting-penetration composition and application method thereof |
| CN105838986A (en) * | 2016-05-23 | 2016-08-10 | 安徽鑫宏机械有限公司 | Casting method of scum gate valve body for mining |
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| DE19917175A1 (en) * | 1999-04-16 | 2000-10-19 | Daimler Chrysler Ag | Component, especially an automobile part or a cooling body for power electronics or fuel cells, is produced by positioning a binder-freed porous ceramic green body in a die casting die prior to light metal pressure infiltration |
| CA2468352C (en) * | 2001-12-04 | 2010-06-15 | Claude Poncin | Cast parts with enhanced wear resistance |
| CN1256207C (en) * | 2002-07-03 | 2006-05-17 | 兰州理工大学 | Copper and copper alloy surface casting and penetrating process |
| CN100384609C (en) * | 2002-11-05 | 2008-04-30 | 鲍志勇 | Casting infiltration method of heating power for preparing composite alloy material with metal base |
| DE102005042473B4 (en) * | 2005-09-07 | 2012-04-05 | Gelita Ag | A coating agent for producing a protective layer on a ceramic surface of a casting tool, a ceramic surface casting tool, a method for producing a protective layer on a ceramic surface and a method for curing a damage of the protective layer |
| CN102787253B (en) * | 2012-07-26 | 2014-07-02 | 西安理工大学 | Preparation method for SiC and graphite hybrid reinforced copper-based surface composite material |
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